noun
removal of dissolute sons from the family register (Edo period)
Historical legal term from the Edo period. Refers to the practice of striking a wayward son from the family register, effectively disowning him.
江戸時代には、放蕩息子を久離にする制度があった。
In the Edo period, there was a system for removing dissolute sons from the family register.
The term is composed of 久 (long, lasting) and 離 (separation, removal). The exact historical derivation is uncertain; it is a specialized Edo-period legal term.